Type-bar mounting.



M, PFAU. TYPE BAR MOUNTING.

APPLIOATION FILED A173. m, 1911.

1,018,986. Patented Feb. 27, 1912.

INVENTOR MAX PFAII, or woons'roox, 'LLINoIs, ASSIGNOR T0 'rnn nmnnso vrYrEwnITEn 00., or woonsrocx, ILLINOIS, A CORPORATION or ILLINOIS.

' Turn-Ban. MOUNTING.

Specification 0: Letters Patent. t te 27, Application filed April 14,1911. Serial No. 621,101

To all whom it may concern:

Be it known that I, Max PFAU, a citizen of Saxony, Germany, residing atWoodstock, in the county of McHenry and State of Illinois,'have inrented certain new and useful Improvements in Type-Bar Mountings, ofwhich the following is a specification.

The present invention relates to a form of mounting used in positioninga. type bar upon the body of a typewrit-in machine, and to thearrangement of t e tension mechanism utilized in returning the typebarto normal position. v p

The objects of the present invention ar'e, to provide a mounting. for,the. type bar which will insure against a loosenmgaind" justing thisspring tension. 'Anda. still further object of the invention is toprovide a rail in which the members are mounted which adjust the tensionof the spring controlling the movements of the type bar, and to soposition this rail that it will serve as a reinforcement for the typesupport ng frame.

The invention-further consists in the features of construction and thecombination of parts hereinafter described and claimed. In the drawings,Figure 1 -is an elevation of a type supporting frame of'the presentinvention, showing type bars connected thereto which are equipped withthe devices of the present invention; and Fig. 2, a view showing a typebar with the appliances. of

the present invention thereon, and showing,

in sections, the rails in which'said bar is mounted.

In the typewriter art, it is necessary to provide a framework in whichthe type bars are mounted, and it is necessary to so, mount the typebars within the framework that accommodations may be made for thesubsequent wearing of the bearings, so that loosenin of the bar in itsmounting will not resu t. Thisloosening is objectionable for severalreasons, among theprincipal be ing that-it results in a rattling of thebearlng urlng the operation of the machine, and also results in anincorrect movement of the bar, which may cause the type to misaline inthe writing operation. It-is further necessary to provide some tensionacting means for returning the type bars to normal position after theyhave been thrown forward and have'completed the writing operation. It isdeemed expedient to provide some means fonadjusting this spring tensionso that the bar may be returned to its normal position at the properspeed. If too great aspring tension is placed upon the bar, it mayresultinthe bar returning before it has fully completed its stroke, and hencethe character is-notimprinted. If the bar is returnedtoo slowly, it mayresult in the .next successively acting bar striking 'the former barbefore it returns, and hence a piling of the type result. It is,therefore, essential, in order to properly perform thewritingioperation, to adjust the spring tension .on the type bar sons togive wit the proper speed of return to normal position.

Referring to the drawings, there 1s shown a type supporting frame 3,which may be I of any suitable form and size, the particular form shownbeing for illustrative purposes only. The type bar frame, as shown,consists 015 an upper rail 4 and a lower rail 5. Mounted-within theserails are a series of type bars-6, which also may be of any suitablesize and formation, the particular style shown being merely forillustrative purposes. The type bars are provided with an upper conebearing 'i and a lower cone bearing 8, each'of these cone bearings beingmounted within suitable recesses within the respective rails. I

The use of a cone bearing in a swinging type bar is deemed to be animportant item, since by means of this particular form, the wearing awayof the hearing within the rail ways maintained firm and rigid; It is, ofcourse, understood in the mechanical art that a cone bearing can be veryeasily adjusted so as to bring it to a firm seat in the member in whichit is mounted.

Each of the iowe cone hearings 8 can be compensated for and the bearingalmates in a slottedstem 9; and secured to the lower end of the 'frame 3is a rail 10, as shown, of -channel formation. Mounted within this rail10 are a series of pins 11, each consisting of a body portion 12terminating in a reduced stem 13, the reduced stems each being providedwith a notch similar to the notch in the stems 9. body portions 12 aresplit, as at 1.4, so that they consist of what may be termed leaves 15.The material of which these pins are formed is of such a nature as togive. to the leaves a spring property; that is, they are formed so as tonormally extend in a direction divergent from one another, being spreadapart at their lower ends.

-The upper flange of the rail 10 is provided with openings 16, throughwhich the reduced ends 13 of the pins 11 extend; and the lower flange ofthe rail 10 is provided with openings 17, through which the body portionof the pins extends. The leaves 15 of the pins are sprung together whenthey are inserted within the openings 17, so that they spring againstthe side walls of said openings and are held against displacementtherefrom by spring tension or friction. It will be noted that-the endsof the pins 11 project slightly beyond the rail. This .is to permit ofthe lower portion of the slot in the body portion extending intoaposition where a tool can be inserted therein for the purpose :ofrevolvingthe pin within the rail 10. The spring tension on the leaves 15is sufficient tov prevent the pins 11 from becoming displaced'fromthe-rail l0 and to revent rotative movement of the pins within the railunder ordinary conditions of usage.

Interposed between the adjacent ends of the pins 11.and the stems 9 aretension members 18, which, as shown, are in the form of helically coiledsprings having one free end inserted within the slot in the reduced end13 of the pins' 11. These tension members control the return-movementsof the type bars, and they are regulated so as to sion-property in thefollowing manner: A tool is inserted in the lower end of the slot orrecess in the body of the pins 11, and the 'in is revolved within therail 10. The type ars are held against swinging movement during suchrevolution of the pin. The stem 9 on the ty e bar-will remain fixed andthe reducedv end 13 of the pin 11 will be revolved. This, of course,results in the winding up the sprin 18, and hence the increasing of thetensional owers thereof. The pins are held suiiicient y rigid byfriction,' so that the ower of the spring will not turn them in t ebearings in the rail 10. If the tension power desired to be decreased,the'pin'll will, of course, be revolvedin a reverse direction. Thespring The a property of the leaves 15 issufiicient to hold sa1d-p1nsagainst revolution simultaneouslyspeed of return movement of the typebar,

and so the greater or less initial strength placed in the spring willdetermine the speed of movement with which the by e bar is returned,and, as heretofore exp ained, this initial strength can .be determinedby an adjustmentof the pin 11. i

It will be noted that in the present con struction all of the screwthreaded members for the purpose of regulating the 5 ring tension on.the type bar are eliminat It will be further noted that by utilizingthe bar 10, which extends from side to side of the type supportingframe, this bar serves to strengthen and increase the rigidity of theframe.

I claim: I

.1. In combination with a vertically extending swinging type bar, amounting for said bar, an adjustablemember/spacedaway from the'lower endof the bar and extending approximately parallel therewith, and a tensionmember having one end attached to the lower end of the type bar and itsother end attached to the adjustable member, substantially as described.

2. In combination with a swinging type bar, a mounting for said bar, anadjustable member held by friction against rotative movement withthebar, a tension member having one end attached to the lower end of thetype bar and its other end attached to the adjustable member, and a railin which the adjustable member is mounted, substantially as described.

3. In combination with a swinging type bar, a mounting for said bar, afrietionallyheld rotatable pin-like member spaced away from the lowerend of the bar and held by friction against rotative movement with thebar, and a tension member having one end attached to the lower end ofthe type bar and its other end attached to the pin-like member,substantially as described.

4. In combination with a swinging type bar, a mounting for said bar, africtionallyheld rotatable pin-like member spaced away from the lowerend of the bar and held by friction against rotative movement with thebar, a tension member having one end attached to the lower end of thetype bar and its other end attached to the p'in-likememher, and ,a barof channel formation in which the pin-like member is mounted,substantially as described.

5. In combination with a swinging type bar, a mounting for said bar, apin having a split body portion lying below said bar, a

. rail in which said-pin is mounted, the split formation of said pintending to hold it within said rail by frictional engagement,

said pin having a notched end, and a ten-' 'sion member having one endattached to the bar anl the. other end attached to saidad justingmember, and adapted to be wound and unwound in accordance with themovements of the type bar, substantially as descrlbed.

7. In combination with .a swinging type bar, a mounting for said bar, anadjustable member normally held by friction against movement withrespect to the swinging movement of said type bar, a tension mem-' herhaving one end attachedto the type bar and the other end attached tosaid adjustjustable member is mounted, substantially as described.

8. In combination with a swinging type bar, a mounting for said bar, asplit pin, a mounting for said pin, whereby itis held by frictionalengagement against rot'ative movement with said bar, and a tension ablemember, and a rail in which said ad member having one end secured to thepin and the other end secured to the type bar,

substantially as described. p v

9. In combination with a swinging type bar, means for returning the barto normal position consisting of a coil spring dependmg therefrom, andmeans for winding and unwinding sald spring to regulatevthe ten tion onsaid bars, substantially as described.

- MAX PFAU.

Witnessesz D. C. Ali EBB, FRANK WILDER.

